mini-led-cube/firmware/usb.c

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/*
* CTHN.de MiniLEDCube
*
* usb.h by Kai Lauterbach 11/2011
*
* Based on project: hid-custom-rq example by Christian Starkjohann
* Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
*
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
*
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*/
#include "usb.h"
/* ------------------------------------------------------------------------- */
usbMsgLen_t usbFunctionSetup(uchar data[8])
{
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usbRequest_t *rq = (void *)data;
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if ( (rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_VENDOR )
{
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if ( rq->bRequest == CUSTOM_RQ_SET_FRAME )
{
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// because of the code size we have to transfer one frame in
// two steps (control messages)
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if ( ! rq->wIndex.bytes[0] )
{
// the lower word
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frame = (frame & (uint32_t)0xffff0000) |
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( rq->wValue.bytes[0] +
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(rq->wValue.bytes[1] << 8) );
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} else {
// the high word
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frame = (frame & (uint32_t)0x0000ffff) |
((uint32_t)( rq->wValue.bytes[0] +
(rq->wValue.bytes[1] << 8) ) << 16);
}
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} else if ( rq->bRequest == CUSTOM_RQ_EEPROM_STORE_FRAME )
{
// save the actual frame to the eeprom
// don't forget to send a frame first
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eeprom_write_dword( &eep_anim[ rq->wIndex.bytes[0] ], frame );
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} else if ( rq->bRequest == CUSTOM_RQ_SET_MODE )
{
// set the firmware mode
// 0 = stop; 1 = single; 2 = loop
mode = rq->wValue.bytes[0];
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}
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}
return 0; /* default for not implemented requests: return no data back to host */
}
/* ------------------------------------------------------------------------- */
void init_usb(void)
{
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uint8_t i;
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usbInit();
usbDeviceDisconnect(); /* enforce re-enumeration, do this while interrupts are disabled! */
// fake USB disconnect for > 250 ms
while(--i)
{
asm volatile("nop"::);
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}
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usbDeviceConnect();
}
/* ------------------------------------------------------------------------- */